noun

notes

Etymology submission (likely folk):

The Marines were used by ship's skippers as a police force. Marines were often taller than the sailors. When ordered to quell fights below decks, they often banged their heads on the beams. As often as they jarred their heads, while responding to trouble, they eventually became known as jarheads.

More info:

Interactive stats:

L

John Wayne said "Lock and load" because that is the procedure used for readying an empty M1 Garand for action, not because he said it backwards. In order to prepare the weapon for firing, the bolt must first be "locked" back to the rear so that the en bloc clip can be "loaded" into the fixed magazine. Once the clip is inserted, the bolt snaps forward on its own as soon as thumb pressure is released from the top round of the clip, chambering a round and leaving it ready to fire.

origin

From military aviation. A pilot reports "no joy" when an attempt to establish visual or radio contact with another aircraft is unsuccessful; or when an attempt to acquire a target - either visually or on tactical radar - is unsuccessful.